Mordecai and Rigby vs Gumball and Darwin was originally the first installment of Epic Cartoon Made Rap Battles. It features the two best friends from the Regular Show, Mordecai and Rigby against the two best friends from The Amazing World of Gumball, Gumball and Darwin. It was released on October 29th, 2013. The video is removed on YouTube, but the audio is still available on SoundCloud. The provided video is a re-upload.